Harrey moore



(No Model.)

m u T 2 E N T. H G A M m BI DDW O M0 .F

S .I N A H nu E M G N I T A U T G A No. 520,759. Patented May 29, 1894.

INVENTOR Mme. 7a Allorne ys. I

WIT/V56 SE5.

(No Model.) 2 Sheets-Sheet 2.

H. MOORE. AGTUATING MECHANISM FOR SEWING MACHINE SHUTTLES. No. 520,759.

Patented May 29, 1894.

UNITED STATES PATENT OFFICE.

HARREY MOORE, OF WELLINGBOROUGH, ENGLAND.

ACTUATING MECHANISM FOR SEWING-MACHINE SHUTTLE S.

SPECIFICATION forming part of Letters Patent N0. 520,? 59, dated May 29,1894.

Applicationfiled March 30, 1891. Serial No. 387,065. (No model.)Patentedin England February 12, 1891, No. 2,514; in Germany March6,1891, No.58,713; in France May 11 1891, No. 213,867, and in BelgiumMay 11, 1891, No. 94,860.

To all whom it may concern.-

Be it known that I, HARREY MOORE, a subject of the Queen of GreatBritain, residing at Wellingborough, in the county of Northampton,England, have invented new and useful Improvements in Driving Mechanismfor Rotary Hooks of Sewing-Machines, (for which I have obtained patentsin Great Britaimdated February 12, 1891, No. 2,514; in Germany, datedMarch 6, 1891, No. 58,713; in France, dated May 11, 1891,'N0. 213,367,and in Belgium, dated May 11, 1891, No. 94,860,) of which the followingis a specification.

This invention relates to mechanism for driving rotary hooks of sewingmachines such as are usually mounted in a race to be rotated by a driverextending from a rotating shaft.

In operation the thread of the loop is formed by the rotating hook andhas to pass between the driver and the point of contact thereof with therotary hook and in this manner an uncertain strain is put upon thethread during the formation of the stitch. I

The object of my invention is to avoid the necessity of passing thethread between the contact surfaces of the rotary hook and its driver.For this purpose I provide a double driving mechanism making contactwith the rotary hook at two points alternately and thereby creatingrelease from contact of the double driving mechanism with the parts ofthe rotary hook upon which the same operates alternately at the requiredtime for allowing the passage of the thread of the loop withouthindrance.

Rotary hooks for sewing machines are ordinarily rotated at a speedvariable in the course of each revolution in order that they may movethe slower while the hook takes the thread from the needle and thenrecover the lost time during the remainder of their revolution. Thisvariable speed is obtained by connecting two lengths of shaft situatedin parallel lines, by means of a link, the variation in speed atdifierent parts of the revolution being due to the eccentricity of thecenters of the shafts so linked as each to perform a complete revolutionin the same period of time, though the shaft which derives its rotatesat a speed variable throughout each complete revolution.

My invention consists in deriving from the 7 main shaft by means ofdouble link mechanism, movement for two shafts one of which being hollowis traversed by the other placed concentrically therein. At theextremities of these two shaftsl provide projections constituting thedouble driving mechanism hereinafter more fully described by referenceto the accompanying drawings in all the figures of which the same partis indicated by like reference letters.

Figure 1 is an endview of parts of a sewing machine showingthe doubledriving mechanism for the rotary hook. Fig. 2 is a sectionalelevationand Fig. 3 is an under plan of the machine shown in Fig. 1,parts being in section. Fig. 4 shows the position ofthe links whenthetwo members of the driving mechanism are at their greatest distanceapart. Fig. 5 shows the position of the links when the two members ofthe driving mechanism are at their point of nearest approach. Fig. 6shows the driving mechanism one member of which engages the rotary hookto drive the'same the other being removed from contact at the point.where the hook receives the thread loop from the needle. Fig. 7 showsthe driving mechanism engaging the rotary hook at its point andremoved'from contact at the other driving end. Fig. 8 is a perspectiveview of the parts J K of the'driving mechanism.

A represents the cloth plate of a rotary hook sewing machine to which myinvention is applicable, B being the needle bar and C the presser foot.

From the main shaft D I communicate a variable motion by means of linksE F to the shafts G H of the two drivers which are both supported in thesame bearing the one H traversing the one G made hollow for thatpurpose. The shafts G H being set in a line parallel with the axis ofthe main shaft D but not in the same plane and deriving their motionfrom the said main shaft by the intervention of links F. F each make onecomplete revolution in the same period of time as that 50 motion fromthe other by means of the link occupied by one revolution of the mainshaft but the speed of the shafts G H as compared with the speed of themain shaft varies at diiferent points of the revolution. As the links EF are connected with the main shaft D one in advance of the other thevariable speed of the shafts G II is not equally timed in both cases andconsequently the driving arm J projecting from the shaft G and thedriving arm K projecting from the shaft II during each completerevolution advance toward or recede from each other. This want ofuniformity in the period of greatest acceleration and of greatestretards tion in speed of the shafts G and II respectively causes thedriving arms J and K alternately to make contact with thedrivingabutments L and M leaving an opening free between the driver and thedriving abutment upon the rotary hook N first to admit the thread loopupon the rotary hook and then to allow it to be released therefromwithout hindrance. The driving arm J is slotted at P to allow therequired dip for the needle.

It will be seen by reference to Fig. 6 that the rotary hook N shown inposition to receive the thread loop from the needle is driven by thedriver J making contact with the driving abutment L and leaving a clearspace for entrance of the thread loop between the driver K and the hookwhich receives the thread loop from the needle. Likewise it will be seenby reference to Fig. 7 that the rotary hook N shown in position torelease the thread loop for the completion of the stitch by take upmechanism usually employed is driven by the driver K making contact withthe driving abutment M and leaving a clear space for the escape of thethread loop between the driver J and the driving abutment L.

What I claim as myinvention, and desire to secure by Letters Patent, is-

The combination in asewing machine of a rotary shuttle working in a raceand provided with two driving abutments, of a shuttle race, of a mainshaft, of two coaxial driving shafts eccentric to the main shaft, of twocrank arms and links connecting the main shaft with the two drivingshafts and arranged one setin advance of the other, and of two driversmounted on the driving shafts and adapted to engage alternately with thetwo driving abutments substantially as set forth for the purposespecified.

IIARREY MOORE. Witnesses:

SAMUEL BELL,

Oxford Street, lVellz'ngboroug i'l. WILLIAM FISH.

